I can't speak to the user name, as mine has always matched the login. It would be much easier to change your folding name, as you would only lose a couple work units' credit at this point. That part is up to you.
You have a very good system for folding and will make your bucks and beyond easily. For setting up the client in the most efficient way possible, first, if you haven't already, make sure to be using the v7 client found
here. (Scroll down to "Start Folding")
Secondly, you will need a passkey to earn bonus points for QRB (quick return bonus). Details on the passkey can be found
here. The link to get one is also there. Once you complete 10 WU's, you will begin getting bonus points.
Thirdly, you will need to set your GPU slot to client-type advanced in your client options. This will allow you to get the QRB work units on your GPU. The simplest guide I know of is found
here. It is up to you if you want to fold on the CPU as well or not. It is not as efficient as the GPUs, but it still will do good work.
Outside of the client, you should shut off SLI when running folding, as it is much more effective. You can track your points and your meteoric rise at
http://folding.extremeoverclocking.com/user_summary.php?s=&u=646675.
These are the basics to getting your system running effectively. Welcome to the team, and feel free to ask any questions you have! There are a lot of people willing to help!